Sure.....

After the engine is shutdown and it sits overnight, a normal engine won't have pressure in the cooling system.......in fact.....it will probably have slight vacuum.

An engine with a crack into the cooling system will pressurize the cooling system and the pressure will remain overnight. So, the upper hose will feel very firm when you squeeze it. Then, open the cap, squeeze the hose again, and see if it is now soft. If the pressure came off.........which would also be noticeable by the escape of air upon cap release........the hose will now be soft.

A classic sign of either a bad head gasket or a cracked head. But, you can't tell which is the culprit........however on the 603, the odds are not in your favor.